package com.paper.view.fragment;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.SharedPreferences;
import android.content.res.Configuration;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.support.v4.app.Fragment;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v7.app.ActionBar;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBarDrawerToggle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ExpandableListView;
import android.widget.ExpandableListView.OnChildClickListener;
import android.widget.ExpandableListView.OnGroupExpandListener;
import android.widget.TextView;
import android.widget.Toast;

import com.paper.R;
import com.paper.view.MainActivity;
import com.paper.view.asynctask.LoadNavDrawUiTask;

import dswork.android.lib.core.util.InjectUtil;
import dswork.android.lib.core.util.InjectUtil.InjectView;
import dswork.android.lib.core.util.MyStrictMode;

@SuppressLint("ValidFragment")
public class NavDrawerFragment extends Fragment implements SwipeRefreshLayout.OnRefreshListener
{
	//标记要注入的控件
	@InjectView(id=R.id.swipe_ly) SwipeRefreshLayout mSwipeLayout;
	@InjectView(id=R.id.menu_list_view) ExpandableListView mDrawerListView;
	/**
	 * 记录选中的抽屉项位置
	 */
	private static final String STATE_SELECTED_POSITION = "selected_navigation_drawer_position";
	private static final String STATE_SELECTED_ID = "selected_navigation_drawer_id";
	private static final String STATE_SELECTED_NAME = "selected_navigation_drawer_name";
	/**
	 * Per the design guidelines, you should show the drawer on launch until the user manually
	 * expands it. This shared preference tracks this.
	 */
	private static final String PREF_USER_LEARNED_DRAWER = "navigation_drawer_learned";
	/**
	 * 指向当前抽屉项的回调对象
	 */
	private NavigationDrawerCallbacks mCallbacks;
	/**
	 * Helper component that ties the action bar to the navigation drawer.
	 */
	private ActionBarDrawerToggle mDrawerToggle;
	private DrawerLayout mDrawerLayout;
	private View mFragmentContainerView;
	private int mCurrentSelectedPosition = 0;
	private long mCurrentSelectedId = 0l;
	private CharSequence mCurrentSelectedName = "";
	private boolean mFromSavedInstanceState;
	private boolean mUserLearnedDrawer;


	@Override
	public void onAttach(Activity activity)
	{
		super.onAttach(activity);
		try
		{
			mCallbacks = (NavigationDrawerCallbacks) activity;
		}
		catch(ClassCastException e)
		{
			throw new ClassCastException("Activity must implement NavigationDrawerCallbacks.");
		}
	}
	
	@Override
	public void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);
		// Read in the flag indicating whether or not the user has demonstrated awareness of the
		// drawer. See PREF_USER_LEARNED_DRAWER for details.
		SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(getActivity());
		mUserLearnedDrawer = sp.getBoolean(PREF_USER_LEARNED_DRAWER, false);
	}

	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
	{
		MyStrictMode.setPolicy();
		View rootView = inflater.inflate(R.layout.nav_drawer_fragment, container, false);
		InjectUtil.injectView(this, rootView);//注入控件

		mSwipeLayout.setOnRefreshListener(this);
        mSwipeLayout.setColorSchemeResources(R.color.red,R.color.blue_light,R.color.orange,R.color.green);
        
		//异步加载菜单UI
		loadNavDrawUiTask(mSwipeLayout, mDrawerListView, "auto").execute();
		
		//首次打开，默认选中导航第一项
		if(savedInstanceState == null)
		{
			SharedPreferences prefsNavSetting = getActivity().getSharedPreferences(getActivity().getString(R.string.prefs_nav_setting), 0);
			selectItem(0, 
					   prefsNavSetting.getLong("first_section_id", 0), 
					   prefsNavSetting.getString("first_section_name", ""));
		}
		else
		{
			mFromSavedInstanceState = true;
			selectItem(savedInstanceState.getInt(STATE_SELECTED_POSITION),
					   savedInstanceState.getLong(STATE_SELECTED_ID),
					   savedInstanceState.getCharSequence(STATE_SELECTED_NAME));
		}
		return rootView;
	}

	@Override
	public void onRefresh()
	{
		loadNavDrawUiTask(mSwipeLayout, mDrawerListView, "manual").execute();
	}

	@Override
	public void onActivityCreated(Bundle savedInstanceState)
	{
		super.onActivityCreated(savedInstanceState);
		// Indicate that this fragment would like to influence the set of actions in the action bar.
		setHasOptionsMenu(true);
	}
	
	@Override
	public void onSaveInstanceState(Bundle outState)
	{
		super.onSaveInstanceState(outState);
		outState.putInt(STATE_SELECTED_POSITION, mCurrentSelectedPosition);
		outState.putLong(STATE_SELECTED_ID, mCurrentSelectedId);
	}

	@Override
	public void onConfigurationChanged(Configuration newConfig)
	{
		super.onConfigurationChanged(newConfig);
		// Forward the new configuration the drawer toggle component.
		mDrawerToggle.onConfigurationChanged(newConfig);
	}

	@Override
	public void onCreateOptionsMenu(Menu menu, MenuInflater inflater)
	{
		// If the drawer is open, show the global app actions in the action bar. See also
		// showGlobalContextActionBar, which controls the top-left area of the action bar.
		if(mDrawerLayout != null && isDrawerOpen())
		{
//			inflater.inflate(R.menu.global, menu);
			showGlobalContextActionBar();
		}
		super.onCreateOptionsMenu(menu, inflater);
	}

	@Override
	public boolean onOptionsItemSelected(MenuItem item)
	{
		if(mDrawerToggle.onOptionsItemSelected(item))
		{
			return true;
		}
		if(item.getItemId() == R.id.menu_download)
		{
			Toast.makeText(getActivity(), "下载图片"+mCurrentSelectedId, Toast.LENGTH_SHORT).show();
			return true;
		}
		return super.onOptionsItemSelected(item);
	}
	
	@Override
	public void onDetach()
	{
		super.onDetach();
		mCallbacks = null;
	}
	
	/**
	 * 新建LoadMenuUiTask对象
	 * @param mSwipeLayout
	 * @param mDrawerListView
	 * @param refreshMode "auto"/"manual"
	 * @return LoadMenuUiTask
	 */
	private LoadNavDrawUiTask loadNavDrawUiTask(SwipeRefreshLayout mSwipeLayout, ExpandableListView mDrawerListView, String refreshMode)
	{
		return new LoadNavDrawUiTask(getActivity(), mSwipeLayout, mDrawerListView, refreshMode, new LoadNavDrawUiTask.CallBackFn()
		{
			@Override
			public void exeUiSuc(final ExpandableListView mDrawerListView)
			{
				// 单击导航事件
				mDrawerListView.setOnChildClickListener(new OnChildClickListener()
				{
					@Override
					public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id)
					{
						TextView data_id = (TextView)v.findViewById(R.id.item_id);
						TextView data_name = (TextView)v.findViewById(R.id.section_label);
						selectItem(childPosition, Long.valueOf(data_id.getText().toString()), data_name.getText());
						mDrawerListView.setItemChecked(mCurrentSelectedPosition, true);
						return true;
					}
				});
				// 关闭其他分组  
				mDrawerListView.setOnGroupExpandListener(new OnGroupExpandListener() 
				{  
                    @Override  
                    public void onGroupExpand(int groupPosition) 
                    {  
                        for (int i=0, count=mDrawerListView.getExpandableListAdapter().getGroupCount(); i<count; i++) 
                        {  
                            if (groupPosition != i) 
                            {
                            	mDrawerListView.collapseGroup(i);  
                            }  
                        }  
                    }  
                });
				// 默认展开第一个group
				mDrawerListView.expandGroup(0);
			}
			@Override
			public void exeUiErr()
			{
			}
		});
	}

	public boolean isDrawerOpen()
	{
		return mDrawerLayout != null && mDrawerLayout.isDrawerOpen(mFragmentContainerView);
	}

	/**
	 * Users of this fragment must call this method to set up the navigation drawer interactions.
	 * @param fragmentId The android:id of this fragment in its activity's layout.
	 * @param drawerLayout The DrawerLayout containing this fragment's UI.
	 */
	public void setUp(int fragmentId, DrawerLayout drawerLayout)
	{
		mFragmentContainerView = getActivity().findViewById(fragmentId);
		mDrawerLayout = drawerLayout;
		// set a custom shadow that overlays the main content when the drawer opens
		mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START);
		// set up the drawer's list view with items and click listener
		ActionBar actionBar = getActionBar();
		actionBar.setDisplayHomeAsUpEnabled(true);
		actionBar.setHomeButtonEnabled(true);
		
		// ActionBarDrawerToggle ties together the the proper interactions
		// between the navigation drawer and the action bar app icon.
		mDrawerToggle = new ActionBarDrawerToggle(getActivity(), /* host Activity */
											      mDrawerLayout, /* DrawerLayout object */
											      R.string.navigation_drawer_open, /* "open drawer" description for accessibility */
											      R.string.navigation_drawer_close /* "close drawer" description for accessibility */
												  )
		{
			@Override
			public void onDrawerClosed(View drawerView)
			{
				super.onDrawerClosed(drawerView);
				if(!isAdded())
				{
					return;
				}
				getActivity().invalidateOptionsMenu(); // calls onPrepareOptionsMenu()
			}

			@Override
			public void onDrawerOpened(View drawerView)
			{
				super.onDrawerOpened(drawerView);
				((MainActivity)getActivity()).clickKeyBackTimes = 0;
				if(!isAdded())
				{
					return;
				}
				if(!mUserLearnedDrawer)
				{
					// The user manually opened the drawer; store this flag to prevent auto-showing
					// the navigation drawer automatically in the future.
					mUserLearnedDrawer = true;
					SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(getActivity());
					sp.edit().putBoolean(PREF_USER_LEARNED_DRAWER, true).apply();
				}
				getActivity().invalidateOptionsMenu(); // calls onPrepareOptionsMenu()
			}
		};
		// If the user hasn't 'learned' about the drawer, open it to introduce them to the drawer,
		// per the navigation drawer design guidelines.
		if(!mUserLearnedDrawer && !mFromSavedInstanceState)
		{
			mDrawerLayout.openDrawer(mFragmentContainerView);
		}
		// Defer code dependent on restoration of previous instance state.
		mDrawerLayout.post(new Runnable()
		{
			@Override
			public void run()
			{
				mDrawerToggle.syncState();
			}
		});
		mDrawerLayout.setDrawerListener(mDrawerToggle);
	}

	private void selectItem(int position, long data_id, CharSequence data_name)
	{
		mCurrentSelectedPosition = position;
		mCurrentSelectedId = data_id;
		mCurrentSelectedName = data_name;
		if(mDrawerListView != null)
		{
			mDrawerListView.setItemChecked(position, true);
		}
		if(mDrawerLayout != null)
		{
			mDrawerLayout.closeDrawer(mFragmentContainerView);
		}
		if(mCallbacks != null)
		{
			mCallbacks.onNavigationDrawerItemSelected(position, data_id, data_name);
		}
	}

	/**
	 * Per the navigation drawer design guidelines, updates the action bar to show the global app
	 * 'context', rather than just what's in the current screen.
	 */
	private void showGlobalContextActionBar()
	{
		ActionBar actionBar = getActionBar();
		actionBar.setDisplayShowTitleEnabled(true);
		actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);
		actionBar.setTitle(R.string.app_name);
	}

	private ActionBar getActionBar()
	{
		return ((ActionBarActivity)getActivity()).getSupportActionBar();
	}

	/**
	 * Callbacks interface that all activities using this fragment must implement.
	 */
	public static interface NavigationDrawerCallbacks
	{
		/**
		 * Called when an item in the navigation drawer is selected.
		 */
		void onNavigationDrawerItemSelected(int position, long data_id, CharSequence data_name);
	}
}
